//
//  DrawerViewController.m
//  MusicPC
//
//  Created by PengchengWang on 16/2/24.
//  Copyright © 2016年 pengchengWang. All rights reserved.
//

#import "DrawerViewController.h"

@interface DrawerViewController ()<UIGestureRecognizerDelegate>

@end

@implementation DrawerViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    //添加子视图控制器
    //    [self addChildViewController:self.leftVC];
    //    [self addChildViewController:self.rootVC];
    //如果没有手势
    if (!self.tap) {
        self.tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction)];
        [self.tap setEnabled:NO];
        self.tap.delegate = self;
        [self.view addGestureRecognizer:self.tap];
    }
}

//打开抽屉
-(void)openMenu{
    [self showleftViewController:nil];
    [self.tap setEnabled:YES];
    self.rootVC.view.userInteractionEnabled = NO;
}

//手势关闭抽屉
-(void)tapAction{
    [self showRootViewController:nil];
    [self.tap setEnabled:NO];
    self.rootVC.view.userInteractionEnabled = YES;
}

//设置中间视图控制器
-(void)setRootViewController:(UIViewController*)viewcontroller{
    //如果传进来的viewController是空的直接返回
    if (!viewcontroller) {
        return;
    }
    //设置中间视图控制器
    [self.rootVC.view removeFromSuperview];
    self.rootVC = viewcontroller;
    [self addChildViewController:viewcontroller];
    //如果手势交互开着,证明抽屉是打开的
    if (self.tap.enabled) {
        viewcontroller.view.frame = CGRectMake(200, 0, 375, 667);
    }
    [self.view addSubview:viewcontroller.view];
    //关闭抽屉
    [self showRootViewController:nil];
    //设置导航栏
    [self setNaButton];
    
}

//展示中间视图的方法(关闭抽屉)
-(void)showRootViewController:(UIViewController*)rootViewController{
    [UIView animateWithDuration:0.4 animations:^{
        self.rootVC.view.frame = CGRectMake(0, 0, 375, 667);
    }];
    //手势关掉
    [self.tap setEnabled:NO];
    //rootView交互打开
    self.rootVC.view.userInteractionEnabled = YES;
}

//打开抽屉
-(void)showleftViewController:(UIViewController*)leftViewController{
    //手势打开
    [self.tap setEnabled:YES];
    //rootView禁止使用
    self.rootVC.view.userInteractionEnabled = NO;
    /**
     *  只添加一次视图(不写也行)
     */
    if (![self.view.subviews containsObject:self.leftVC.view]) {
        [self.view insertSubview:self.leftVC.view atIndex:0];
    }
    //动画移动根视图
    [UIView animateWithDuration:0.4 animations:^{
        self.rootVC.view.frame = CGRectMake(200, 0, 375, 667);
    }];

}

//设置左上角按钮
-(void)setNaButton{
    UINavigationController *na = (UINavigationController*)self.rootVC;
    UIViewController *vc = na.viewControllers[0];
    vc.navigationItem.leftBarButtonItem = ({
        UIBarButtonItem *item = [[UIBarButtonItem alloc]initWithTitle:@"抽屉" style:(UIBarButtonItemStyleDone) target:self action:@selector(openMenu)];
        item;
    });
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

//手势代理方法
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    if (gestureRecognizer == self.tap) {
        return CGRectContainsPoint(self.view.frame, [gestureRecognizer locationInView:_rootVC.view]);
    }
    return YES;
}

/*
 #pragma mark - Navigation
 
 // In a storyboard-based application, you will often want to do a little preparation before navigation
 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
 // Get the new view controller using [segue destinationViewController].
 // Pass the selected object to the new view controller.
 }
 */

@end
